Abstract

Optically active surfaces that can provide strong localization of electromagnetic fields at predefined points are desired for applications that require high spatial resolution and high sensitivity. Here, we examine the geometric influences on, and polarization dependencies of, electromagnetic near fields on the surface of an array of tailor designed, mesoscalic, silver-coated structures with threefold symmetry characteristics. For spatially resolved mapping of the electromagnetic near fields and examining the influence of polarization, we use a photoelectron emission microscope. We find that the investigated structures not only provide an increase of the near-field intensity at their boundaries, but also that the symmetry centers of the structures focus energy in a polarization dependent manner. Changing the polarization of the incident light enables the localization of near-field intensities without displacing the excitation. Hence we show that breaking of symmetry can provide controllable centers of “hot spots” for the basis of an improved design to gain more efficient surface structures.

© 2009 Optical Society of America

Spatial- and energy-resolved photoemission electron from plasmonic nanoparticles in multiphoton regime

Peng Lang, Xiaowei Song, Boyu Ji, Haiyan Tao, Yinping Dou, Xun Gao, Zuoqiang Hao, and Jingquan Lin
Opt. Express 27(5) 6878-6891 (2019)

Spatial evolution of the near-field distribution on planar gold nanoparticles with the excitation wavelength across dipole and quadrupole modes

Jinghuan Yang, Quan Sun, Han Yu, Kosei Ueno, Hiroaki Misawa, and Qihuang Gong
Photon. Res. 5(3) 187-193 (2017)

Direct near-field optical imaging of plasmonic resonances in metal nanoparticle pairs

Hsing-Ying Lin, Chen-Han Huang, Chih-Han Chang, Yun-Chiang Lan, and Hsiang-Chen Chui
Opt. Express 18(1) 165-172 (2010)

Near-field circular polarization probed by chiral polyfluorene

M. Savoini, P. Biagioni, G. Lakhwani, S. C. J. Meskers, L. Duò, and M. Finazzi
Opt. Lett. 34(22) 3571-3573 (2009)

Plasmon-enhanced total-internal-reflection fluorescence by momentum-mismatched surface nanostructures

Kyujung Kim, Youngjin Oh, Kyungjae Ma, Eunji Sim, and Donghyun Kim
Opt. Lett. 34(24) 3905-3907 (2009)